The World Association Forecast Centre is a meteorological centre which also provides advisory information on the position, forecast direction and speed of movement of tropical cyclones.

The World Area Forecast Centre is a meteorological centre designated to prepare and issue significant weather forecasts and upper-air forecasts.

The World Association Forecast Centre is a meteorological centre designated to prepare and issue significant weather forecasts only.

The World Area Forecast Community is a meteorological centre designated to provide advisory information redarding the lateral and vertical extent and forecast movement of volcanic ash in the atmosphere.